Important quantity selecting circuit



Patented Jan. 12 195 4 IMIPORTAN T QUANTITY SELECTING CIRCUIT Octavio M. Salati, Philadelphia, Pa., assignor to United States of America as represented by the Secretary of the Army Application January 4, 1952, Serial No. 264,960

2 Claims. (01. 307-115) This invention relates to switching systems and more particularly to switching systems for positively selecting one or more of a multiplicity of controlled circuits.

The object of this invention is to provide a control system capable of positively selecting one or more of a multiplicity of controlled circuits while the control system is operating on a completely dissociated power system.

A further object of this invention is to provide a remote control system capable of accomplishing the above object.

These and other objects of this invention will appear in the following description and appended claims, reference being had to the accompanying drawing in which a preferred embodiment of this invention is shown.

In the drawing, a three relay switching system is shown, but it will be apparent from the following description that additional switches and relays may be added to the system to control any number of circuits by merely repeating the circuitry shown as often as necessary.

In the drawing, relays 2, 4 and 6 are shown schematically as a coil and an indicated box, the relationship between the coils and indicated boxes being indicated by the dashed rectangle enclosing conjunctive components. Coils 8, I and I2 are, respectively, the operating coils of relays 2, 4 and 6. Boxes 14, i5 and I8 indicate the circuits controlled by relays 2, 4 and 6, respectively, and also indicate the arms of relays 2, 4 and 6 which act within those circuits to effectuate control thereof. Single-pole doublethrow switches 20, 22 and 24 are shown directly above their associated relays 2, 4 and 6, respectively.

In the drawing, single-pole double-throw switches are shown for simplicity and ease of explanation, but it will be apparent to those skilled in the art that any type of switch, including the contact arms of another relay system may be used.

Switches 29, 22 and 24 are shown in their normal non-operated position in the drawing with one side of each of said switches being connected to common ground wire 26. The pole of each of said switches is connected to a common wire 28 and the other sides of switches 20, 22 and 24 are connected to power source 30 through coils 8, l0 and I2, respectively.

Thus, each coil of every relay in a system according to this invention is connected intermediate a power source and one side of a singlepole double-throw switch, the poles of said switches being connected in common and normally de-energized, but needing only a ground connection to cause them to be energized. Since the poles of each switch are common and since the other side of each switch is connected to a common ground, it is obvious that if any pole be connected to ground by throwing it into contact with the other side of its switch, then the coil associated with that switch will still not have a complete energizing circuit to ground but that all other coils, associated with switches still in their normal position, will complete their energizing circuit to ground through their common pole connection, the other side of the operated switch and the common ground wire.

Thus, the operation of the circuit is accomplished by operating one or more switches and thus causing the coils of all relays not associated with operated switches to become energized and to effectuate selective control of the indicated circuits l4, l6 and [3.

The feasibility of remote operation of a selective system according to this invention is imme diately apparent from the fact that only one wire per controlled circuit need run between the controlling switch panel and th controlled circuits. In the drawing connecting wires 32, 34 and it perform this function for controlled circuits hi, it and I8, respectively. The wires 32, 34 and 36 may be of any desired length.

As many apparently widely different embodiments of this invention may be made without departing from the spirit and scope hereof, it is to be understood that the invention is not limited to its specific embodiments except as defined in the appended claims.

What is claimed is:

1. In a switching system the combination comprising a plurality of switches having at least three contact elements; a plurality of relays; and a two-terminal power source, one side of the operating coils of each of said relays being connected to the firstterminal of said power source, the other side of each of said coils being connected respectively to the first of said contact elements of each of said switches, the second of said contact elements of each of said switches being connected to the second terminal of said power source, in each of said switches the third of said elements is free to make alte"- nate contact with the first and second element and has a common connection with the third of said elements in all the other of said switches.

2. In a switching system the combination comprising a plurality of switches having at least three contact elements; a plurality of two 3 terminal controlled circuits; and a two-terminal power source, one terminal of each of said circuits being connected to the first terminal of said power source, the other terminal of each of said circuits being connected respectively to the first of said contact elements of each of said switches, the second of said contact elements of each of said switches being connected to the second terminal of said power source, in each of said switches the third of said elements is free to make alternate contact with the first and second OCTAVIO M. SALATI.

References Cited in the file Of this patent UNITED STATES PATENTS Name Date McElroy July 5, 1887 Number 

